A drink filling system including: a bottle molding section; a sterilizing section that sterilizes a molded bottle; a rinsing section that rinses the bottle; a filling section that fills and seals the bottle; and a conveying unit that conveys the bottle from the molding section to the filling section. A chamber covers a portion extending from the sterilizing section to the filling section, an atmosphere shut-off chamber is between a sterilizing section chamber and a rinsing section chamber, an exhaust unit for exhausting the atmosphere shut-off chamber and/or the sterilizing section chamber, a clean air supply unit for flowing a clean air from a filling section chamber into the atmosphere shut-off chamber through the rinsing section chamber or for further flowing the air into the sterilizing section chamber, and the air-flow flowing therein is exhausted by the exhaust unit.